121112011021 has 4 divisors (see below), whose sum is σ = 121112707132. Its totient is φ = 121111314912.

The previous prime is 121112010979. The next prime is 121112011043. The reversal of 121112011021 is 120110211121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14257554025 + 106854456996 = 119405^2 + 326886^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112011021 - 2¹³ = 121112002829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112010992 and 121112011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112011051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165775 + ... + 519331.

It is an arithmetic number, because the mean of its divisors is an integer number (30278176783).

Almost surely, 2^121112011021 is an apocalyptic number.

It is an amenable number.

121112011021 is a deficient number, since it is larger than the sum of its proper divisors (696111).

121112011021 is an equidigital number, since it uses as much as digits as its factorization.

121112011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696110.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121112011021 its reverse (120110211121), we get a palindrome (241222222142).

The spelling of 121112011021 in words is "one hundred twenty-one billion, one hundred twelve million, eleven thousand, twenty-one".